Order-disorder phase transitions in Au-Cu nanocubes: from nano-thermodynamics to synthesis
Por:
Mendoza-Cruz, R., Bazan-Diaz, L., Velazquez-Salazar, J. J., Samaniego-Benitez, J. E., Ascencio-Aguirre, F. M., Herrera-Becerra, R., Jose-Yacaman, M., Guisbiers, G.
Publicada:
21 jul 2017
Resumen:
Catalysts have been widely used in industries and can be optimized by
tuning the composition and chemical ordering of the elements involved in
the nano-alloy. Among bi-metallic alloys, the Au-Cu system is of
particular interest because it exhibits ordered phases at low
temperatures. Nevertheless, the temperature at which these ordered
structures are formed is totally unknown at the nanoscale. Consequently,
to speed up the development of these catalysts, this paper theoretically
predicts the structural phase transitions between ordered and disordered
phases for the Au-Cu system by using nano-thermodynamics. Following the
predictions, the suggested annealing temperatures have been carefully
chosen and consequently, Au-Cu ordered nanocubes have been successfully
synthesized through a solventless protocol. The results are fully
supported by electron microscopy observations.
Filiaciones:
Mendoza-Cruz, R.:
Univ Texas San Antonio, Dept Phys & Astron, One UTSA Circle, San Antonio, TX 78249 USA
Bazan-Diaz, L.:
Univ Texas San Antonio, Dept Phys & Astron, One UTSA Circle, San Antonio, TX 78249 USA
Velazquez-Salazar, J. J.:
Univ Texas San Antonio, Dept Phys & Astron, One UTSA Circle, San Antonio, TX 78249 USA
Samaniego-Benitez, J. E.:
Natl Polytech Inst, Ctr Res & Adv Studies, Libramiento Norponiente 2000, Real De Juriquilla 76230, Queretaro, Mexico
Ascencio-Aguirre, F. M.:
Univ Nacl Autonoma Mexico, Inst Phys, Circuito Invest Cient S-N, Coyoacan 04510, DF, Mexico
Herrera-Becerra, R.:
Univ Nacl Autonoma Mexico, Inst Phys, Circuito Invest Cient S-N, Coyoacan 04510, DF, Mexico
Jose-Yacaman, M.:
Univ Texas San Antonio, Dept Phys & Astron, One UTSA Circle, San Antonio, TX 78249 USA
Guisbiers, G.:
Univ Texas San Antonio, Dept Phys & Astron, One UTSA Circle, San Antonio, TX 78249 USA
|